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-rw-r--r--src/decoder/OggUtil.cxx118
1 files changed, 118 insertions, 0 deletions
diff --git a/src/decoder/OggUtil.cxx b/src/decoder/OggUtil.cxx
new file mode 100644
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+++ b/src/decoder/OggUtil.cxx
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+/*
+ * Copyright (C) 2003-2012 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "OggUtil.hxx"
+#include "decoder_api.h"
+
+bool
+OggFeed(ogg_sync_state &oy, struct decoder *decoder,
+ input_stream *input_stream, size_t size)
+{
+ char *buffer = ogg_sync_buffer(&oy, size);
+ if (buffer == nullptr)
+ return false;
+
+ size_t nbytes = decoder_read(decoder, input_stream,
+ buffer, size);
+ if (nbytes == 0)
+ return false;
+
+ ogg_sync_wrote(&oy, nbytes);
+ return true;
+}
+
+bool
+OggExpectPage(ogg_sync_state &oy, ogg_page &page,
+ decoder *decoder, input_stream *input_stream)
+{
+ while (true) {
+ int r = ogg_sync_pageout(&oy, &page);
+ if (r != 0)
+ return r > 0;
+
+ if (!OggFeed(oy, decoder, input_stream, 1024))
+ return false;
+ }
+}
+
+bool
+OggExpectFirstPage(ogg_sync_state &oy, ogg_stream_state &os,
+ decoder *decoder, input_stream *is)
+{
+ ogg_page page;
+ if (!OggExpectPage(oy, page, decoder, is))
+ return false;
+
+ ogg_stream_init(&os, ogg_page_serialno(&page));
+ ogg_stream_pagein(&os, &page);
+ return true;
+}
+
+bool
+OggExpectPageIn(ogg_sync_state &oy, ogg_stream_state &os,
+ decoder *decoder, input_stream *is)
+{
+ ogg_page page;
+ if (!OggExpectPage(oy, page, decoder, is))
+ return false;
+
+ ogg_stream_pagein(&os, &page);
+ return true;
+}
+
+bool
+OggExpectPageSeek(ogg_sync_state &oy, ogg_page &page,
+ decoder *decoder, input_stream *input_stream)
+{
+ size_t remaining_skipped = 16384;
+
+ while (true) {
+ int r = ogg_sync_pageseek(&oy, &page);
+ if (r > 0)
+ return true;
+
+ if (r < 0) {
+ /* skipped -r bytes */
+ size_t nbytes = -r;
+ if (nbytes > remaining_skipped)
+ /* still no ogg page - we lost our
+ patience, abort */
+ return false;
+
+ remaining_skipped -= nbytes;
+ continue;
+ }
+
+ if (!OggFeed(oy, decoder, input_stream, 1024))
+ return false;
+ }
+}
+
+bool
+OggExpectPageSeekIn(ogg_sync_state &oy, ogg_stream_state &os,
+ decoder *decoder, input_stream *is)
+{
+ ogg_page page;
+ if (!OggExpectPageSeek(oy, page, decoder, is))
+ return false;
+
+ ogg_stream_pagein(&os, &page);
+ return true;
+}